On 01/06/2015 14:46, carol white via R-help wrote:
Hi,By default the merge function should take the intersection of column names
(if this is understood from by = intersect(names(x), names(y)),
Dear Carol
The by parameter specifies which columns are used to merge by. Did you
understand it to be which columns are retained in the result?
Just a hunch, and if not then you need to give us a toy example.
but it takes all columns. How to specify the intersection of column names?
Thanks
Carol
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Michael
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